removed Makefile; lifted repo/org.ibex.tool/src/ to src/
[org.ibex.tool.git] / src / org / eclipse / jdt / internal / compiler / lookup / MethodVerifier.java
diff --git a/src/org/eclipse/jdt/internal/compiler/lookup/MethodVerifier.java b/src/org/eclipse/jdt/internal/compiler/lookup/MethodVerifier.java
new file mode 100644 (file)
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--- /dev/null
@@ -0,0 +1,533 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2004 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials 
+ * are made available under the terms of the Common Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ * 
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.jdt.internal.compiler.lookup;
+
+import org.eclipse.jdt.core.compiler.CharOperation;
+import org.eclipse.jdt.internal.compiler.ast.MethodDeclaration;
+import org.eclipse.jdt.internal.compiler.ast.TypeDeclaration;
+import org.eclipse.jdt.internal.compiler.problem.ProblemReporter;
+import org.eclipse.jdt.internal.compiler.util.HashtableOfObject;
+
+public final class MethodVerifier implements TagBits, TypeConstants {
+       SourceTypeBinding type;
+       HashtableOfObject inheritedMethods;
+       HashtableOfObject currentMethods;
+       ReferenceBinding runtimeException;
+       ReferenceBinding errorException;
+       LookupEnvironment environment;
+/*
+Binding creation is responsible for reporting all problems with types:
+       - all modifier problems (duplicates & multiple visibility modifiers + incompatible combinations - abstract/final)
+               - plus invalid modifiers given the context (the verifier did not do this before)
+       - qualified name collisions between a type and a package (types in default packages are excluded)
+       - all type hierarchy problems:
+               - cycles in the superclass or superinterface hierarchy
+               - an ambiguous, invisible or missing superclass or superinterface
+               - extending a final class
+               - extending an interface instead of a class
+               - implementing a class instead of an interface
+               - implementing the same interface more than once (ie. duplicate interfaces)
+       - with nested types:
+               - shadowing an enclosing type's source name
+               - defining a static class or interface inside a non-static nested class
+               - defining an interface as a local type (local types can only be classes)
+*/
+public MethodVerifier(LookupEnvironment environment) {
+       this.type = null;  // Initialized with the public method verify(SourceTypeBinding)
+       this.inheritedMethods = null;
+       this.currentMethods = null;
+       this.runtimeException = null;
+       this.errorException = null;
+       this.environment = environment;
+}
+private boolean areParametersEqual(MethodBinding one, MethodBinding two) {
+       TypeBinding[] oneArgs = one.parameters;
+       TypeBinding[] twoArgs = two.parameters;
+       if (oneArgs == twoArgs) return true;
+
+       int length = oneArgs.length;
+       if (length != twoArgs.length) return false;
+
+       for (int i = 0; i < length; i++)
+               if (!areTypesEqual(oneArgs[i], twoArgs[i])) return false;
+       return true;
+}
+private boolean areReturnTypesEqual(MethodBinding one, MethodBinding two) {
+       return areTypesEqual(one.returnType, two.returnType);
+}
+private boolean areTypesEqual(TypeBinding one, TypeBinding two) {
+       if (one == two) return true;
+       if (one instanceof ReferenceBinding && two instanceof ReferenceBinding)
+               // can compare unresolved to resolved reference bindings
+               return CharOperation.equals(((ReferenceBinding) one).compoundName, ((ReferenceBinding) two).compoundName);
+       return false; // all other type bindings are identical
+}
+private void checkAbstractMethod(MethodBinding abstractMethod) {
+       if (mustImplementAbstractMethod(abstractMethod)) {
+               TypeDeclaration typeDeclaration = this.type.scope.referenceContext;
+               if (typeDeclaration != null) {
+                       MethodDeclaration missingAbstractMethod = typeDeclaration.addMissingAbstractMethodFor(abstractMethod);
+                       missingAbstractMethod.scope.problemReporter().abstractMethodMustBeImplemented(this.type, abstractMethod);
+               } else {
+                       this.problemReporter().abstractMethodMustBeImplemented(this.type, abstractMethod);
+               }
+       }
+}
+private void checkAgainstInheritedMethods(MethodBinding currentMethod, MethodBinding[] methods, int length) {
+       nextMethod : for (int i = length; --i >= 0;) {
+               MethodBinding inheritedMethod = methods[i];
+               if (currentMethod.isStatic() != inheritedMethod.isStatic()) {  // Cannot override a static method or hide an instance method
+                       this.problemReporter(currentMethod).staticAndInstanceConflict(currentMethod, inheritedMethod);
+                       continue nextMethod;
+               }
+
+               if (!currentMethod.isAbstract() && inheritedMethod.isAbstract()) {
+                       if ((currentMethod.modifiers & CompilerModifiers.AccOverriding) == 0)
+                               currentMethod.modifiers |= CompilerModifiers.AccImplementing;
+               } else {
+                       currentMethod.modifiers |= CompilerModifiers.AccOverriding;
+               }
+
+               if (!areReturnTypesEqual(currentMethod, inheritedMethod)) {
+                       this.problemReporter(currentMethod).incompatibleReturnType(currentMethod, inheritedMethod);
+               } else {
+                       if (currentMethod.thrownExceptions != NoExceptions)
+                               this.checkExceptions(currentMethod, inheritedMethod);
+                       if (inheritedMethod.isFinal())
+                               this.problemReporter(currentMethod).finalMethodCannotBeOverridden(currentMethod, inheritedMethod);
+                       if (!this.isAsVisible(currentMethod, inheritedMethod))
+                               this.problemReporter(currentMethod).visibilityConflict(currentMethod, inheritedMethod);
+                       if (environment.options.reportDeprecationWhenOverridingDeprecatedMethod && inheritedMethod.isViewedAsDeprecated()) {
+                               if (!currentMethod.isViewedAsDeprecated() || environment.options.reportDeprecationInsideDeprecatedCode) {
+                                       // check against the other inherited methods to see if they hide this inheritedMethod
+                                       ReferenceBinding declaringClass = inheritedMethod.declaringClass;
+                                       if (declaringClass.isInterface())
+                                               for (int j = length; --j >= 0;)
+                                                       if (i != j && methods[j].declaringClass.implementsInterface(declaringClass, false))
+                                                               continue nextMethod;
+
+                                       this.problemReporter(currentMethod).overridesDeprecatedMethod(currentMethod, inheritedMethod);
+                               }
+                       }
+               }
+       }
+}
+/*
+"8.4.4"
+Verify that newExceptions are all included in inheritedExceptions.
+Assumes all exceptions are valid and throwable.
+Unchecked exceptions (compatible with runtime & error) are ignored (see the spec on pg. 203).
+*/
+private void checkExceptions(MethodBinding newMethod, MethodBinding inheritedMethod) {
+       ReferenceBinding[] newExceptions = resolvedExceptionTypesFor(newMethod);
+       ReferenceBinding[] inheritedExceptions = resolvedExceptionTypesFor(inheritedMethod);
+       for (int i = newExceptions.length; --i >= 0;) {
+               ReferenceBinding newException = newExceptions[i];
+               int j = inheritedExceptions.length;
+               while (--j > -1 && !this.isSameClassOrSubclassOf(newException, inheritedExceptions[j])){/*empty*/}
+               if (j == -1)
+                       if (!(newException.isCompatibleWith(this.runtimeException()) || newException.isCompatibleWith(this.errorException())))
+                               this.problemReporter(newMethod).incompatibleExceptionInThrowsClause(this.type, newMethod, inheritedMethod, newException);
+       }
+}
+private void checkInheritedMethods(MethodBinding[] methods, int length) {
+       MethodBinding first = methods[0];
+       int index = length;
+       while (--index > 0 && areReturnTypesEqual(first, methods[index])){/*empty*/}
+       if (index > 0) {  // All inherited methods do NOT have the same vmSignature
+               this.problemReporter().inheritedMethodsHaveIncompatibleReturnTypes(this.type, methods, length);
+               return;
+       }
+
+       MethodBinding concreteMethod = null;
+       if (!type.isInterface()) {  // ignore concrete methods for interfaces
+               for (int i = length; --i >= 0;) {  // Remember that only one of the methods can be non-abstract
+                       if (!methods[i].isAbstract()) {
+                               concreteMethod = methods[i];
+                               break;
+                       }
+               }
+       }
+       if (concreteMethod == null) {
+               if (this.type.isClass() && !this.type.isAbstract()) {
+                       for (int i = length; --i >= 0;) {
+                               if (mustImplementAbstractMethod(methods[i])) {
+                                       TypeDeclaration typeDeclaration = this.type.scope.referenceContext;
+                                       if (typeDeclaration != null) {
+                                               MethodDeclaration missingAbstractMethod = typeDeclaration.addMissingAbstractMethodFor(methods[0]);
+                                               missingAbstractMethod.scope.problemReporter().abstractMethodMustBeImplemented(this.type, methods[0]);
+                                       } else {
+                                               this.problemReporter().abstractMethodMustBeImplemented(this.type, methods[0]);
+                                       }
+                                       return;
+                               }
+                       }
+               }
+               return;
+       }
+
+       MethodBinding[] abstractMethods = new MethodBinding[length - 1];
+       index = 0;
+       for (int i = length; --i >= 0;)
+               if (methods[i] != concreteMethod)
+                       abstractMethods[index++] = methods[i];
+
+       // Remember that interfaces can only define public instance methods
+       if (concreteMethod.isStatic())
+               // Cannot inherit a static method which is specified as an instance method by an interface
+               this.problemReporter().staticInheritedMethodConflicts(type, concreteMethod, abstractMethods);   
+       if (!concreteMethod.isPublic())
+               // Cannot reduce visibility of a public method specified by an interface
+               this.problemReporter().inheritedMethodReducesVisibility(type, concreteMethod, abstractMethods);
+       if (concreteMethod.thrownExceptions != NoExceptions)
+               for (int i = abstractMethods.length; --i >= 0;)
+                       this.checkExceptions(concreteMethod, abstractMethods[i]);
+}
+/*
+For each inherited method identifier (message pattern - vm signature minus the return type)
+       if current method exists
+               if current's vm signature does not match an inherited signature then complain 
+               else compare current's exceptions & visibility against each inherited method
+       else
+               if inherited methods = 1
+                       if inherited is abstract && type is NOT an interface or abstract, complain
+               else
+                       if vm signatures do not match complain
+                       else
+                               find the concrete implementation amongst the abstract methods (can only be 1)
+                               if one exists then
+                                       it must be a public instance method
+                                       compare concrete's exceptions against each abstract method
+                               else
+                                       complain about missing implementation only if type is NOT an interface or abstract
+*/
+private void checkMethods() {
+       boolean mustImplementAbstractMethods = this.type.isClass() && !this.type.isAbstract();
+       boolean skipInheritedMethods = mustImplementAbstractMethods && this.type.superInterfaces() == NoSuperInterfaces
+               && this.type.superclass() != null && !this.type.superclass().isAbstract(); // have a single concrete superclass so only check overridden methods
+       char[][] methodSelectors = this.inheritedMethods.keyTable;
+       nextSelector : for (int s = methodSelectors.length; --s >= 0;) {
+               if (methodSelectors[s] == null) continue nextSelector;
+
+               MethodBinding[] current = (MethodBinding[]) this.currentMethods.get(methodSelectors[s]);
+               if (current == null && skipInheritedMethods)
+                       continue nextSelector;
+
+               MethodBinding[] inherited = (MethodBinding[]) this.inheritedMethods.valueTable[s];
+               if (inherited.length == 1 && current == null) { // handle the common case
+                       if (mustImplementAbstractMethods && inherited[0].isAbstract())
+                               checkAbstractMethod(inherited[0]);
+                       continue nextSelector;
+               }
+
+               int index = -1;
+               MethodBinding[] matchingInherited = new MethodBinding[inherited.length];
+               if (current != null) {
+                       for (int i = 0, length1 = current.length; i < length1; i++) {
+                               while (index >= 0) matchingInherited[index--] = null; // clear the previous contents of the matching methods
+                               MethodBinding currentMethod = current[i];
+                               for (int j = 0, length2 = inherited.length; j < length2; j++) {
+                                       MethodBinding inheritedMethod = inherited[j];
+                                       if (inheritedMethod != null && areParametersEqual(currentMethod, inheritedMethod)) {
+                                               matchingInherited[++index] = inheritedMethod;
+                                               inherited[j] = null; // do not want to find it again
+                                       }
+                               }
+                               if (index >= 0)
+                                       this.checkAgainstInheritedMethods(currentMethod, matchingInherited, index + 1); // pass in the length of matching
+                       }
+               }
+
+               for (int i = 0, length = inherited.length; i < length; i++) {
+                       while (index >= 0) matchingInherited[index--] = null; // clear the previous contents of the matching methods
+                       MethodBinding inheritedMethod = inherited[i];
+                       if (inheritedMethod != null) {
+                               matchingInherited[++index] = inheritedMethod;
+                               for (int j = i + 1; j < length; j++) {
+                                       if (inherited[j] != null && areParametersEqual(inheritedMethod, inherited[j])) {
+                                               matchingInherited[++index] = inherited[j];
+                                               inherited[j] = null; // do not want to find it again
+                                       }
+                               }
+                       }
+                       if (index > 0)
+                               this.checkInheritedMethods(matchingInherited, index + 1); // pass in the length of matching
+                       else if (mustImplementAbstractMethods && index == 0 && matchingInherited[0].isAbstract())
+                               checkAbstractMethod(matchingInherited[0]);
+               }
+       }
+}
+private void checkPackagePrivateAbstractMethod(MethodBinding abstractMethod) {
+       ReferenceBinding superType = this.type.superclass();
+       char[] selector = abstractMethod.selector;
+       do {
+               if (!superType.isValidBinding()) return;
+               if (!superType.isAbstract()) return; // closer non abstract super type will be flagged instead
+
+               MethodBinding[] methods = superType.getMethods(selector);
+               nextMethod : for (int m = methods.length; --m >= 0;) {
+                       MethodBinding method = methods[m];
+                       if (!areReturnTypesEqual(method, abstractMethod) || !areParametersEqual(method, abstractMethod))
+                               continue nextMethod;
+                       if (method.isPrivate() || method.isConstructor() || method.isDefaultAbstract())
+                               continue nextMethod;
+                       if (superType.fPackage == abstractMethod.declaringClass.fPackage) return; // found concrete implementation of abstract method in same package
+               }
+       } while ((superType = superType.superclass()) != abstractMethod.declaringClass);
+
+       // non visible abstract methods cannot be overridden so the type must be defined abstract
+       this.problemReporter().abstractMethodCannotBeOverridden(this.type, abstractMethod);
+}
+/*
+Binding creation is responsible for reporting:
+       - all modifier problems (duplicates & multiple visibility modifiers + incompatible combinations)
+               - plus invalid modifiers given the context... examples:
+                       - interface methods can only be public
+                       - abstract methods can only be defined by abstract classes
+       - collisions... 2 methods with identical vmSelectors
+       - multiple methods with the same message pattern but different return types
+       - ambiguous, invisible or missing return/argument/exception types
+       - check the type of any array is not void
+       - check that each exception type is Throwable or a subclass of it
+*/
+private void computeInheritedMethods() {
+       this.inheritedMethods = new HashtableOfObject(51); // maps method selectors to an array of methods... must search to match paramaters & return type
+       ReferenceBinding[][] interfacesToVisit = new ReferenceBinding[3][];
+       int lastPosition = -1;
+       ReferenceBinding[] itsInterfaces = type.superInterfaces();
+       if (itsInterfaces != NoSuperInterfaces)
+               interfacesToVisit[++lastPosition] = itsInterfaces;
+
+       ReferenceBinding superType = this.type.isClass()
+               ? this.type.superclass()
+               : this.type.scope.getJavaLangObject(); // check interface methods against Object
+       HashtableOfObject nonVisibleDefaultMethods = new HashtableOfObject(3); // maps method selectors to an array of methods
+       boolean allSuperclassesAreAbstract = true;
+
+       while (superType != null) {
+               if (superType.isValidBinding()) {
+                   if (allSuperclassesAreAbstract) {
+                           if (superType.isAbstract()) {
+                                       // only need to include superinterfaces if immediate superclasses are abstract
+                                       if ((itsInterfaces = superType.superInterfaces()) != NoSuperInterfaces) {
+                                               if (++lastPosition == interfacesToVisit.length)
+                                                       System.arraycopy(interfacesToVisit, 0, interfacesToVisit = new ReferenceBinding[lastPosition * 2][], 0, lastPosition);
+                                               interfacesToVisit[lastPosition] = itsInterfaces;
+                                       }
+                               } else {
+                                   allSuperclassesAreAbstract = false;
+                               }
+                       }
+
+                       MethodBinding[] methods = superType.unResolvedMethods();
+                       nextMethod : for (int m = methods.length; --m >= 0;) {
+                               MethodBinding method = methods[m];
+                               if (method.isPrivate() || method.isConstructor() || method.isDefaultAbstract())
+                                       continue nextMethod;
+                               MethodBinding[] existingMethods = (MethodBinding[]) this.inheritedMethods.get(method.selector);
+                               if (existingMethods != null) {
+                                       for (int i = 0, length = existingMethods.length; i < length; i++) {
+                                               if (areReturnTypesEqual(method, existingMethods[i]) && areParametersEqual(method, existingMethods[i])) {
+                                                       if (method.isDefault() && method.isAbstract() && method.declaringClass.fPackage != type.fPackage)
+                                                               checkPackagePrivateAbstractMethod(method);
+                                                       continue nextMethod;
+                                               }
+                                       }
+                               }
+                               MethodBinding[] nonVisible = (MethodBinding[]) nonVisibleDefaultMethods.get(method.selector);
+                               if (nonVisible != null)
+                                       for (int i = 0, l = nonVisible.length; i < l; i++)
+                                               if (areReturnTypesEqual(method, nonVisible[i]) && areParametersEqual(method, nonVisible[i])) 
+                                                       continue nextMethod;
+
+                               if (!method.isDefault() || method.declaringClass.fPackage == type.fPackage) {
+                                       if (existingMethods == null) {
+                                               existingMethods = new MethodBinding[] {method};
+                                       } else {
+                                               int length = existingMethods.length;
+                                               System.arraycopy(existingMethods, 0, existingMethods = new MethodBinding[length + 1], 0, length);
+                                               existingMethods[length] = method;
+                                       }
+                                       this.inheritedMethods.put(method.selector, existingMethods);
+                               } else {
+                                       if (nonVisible == null) {
+                                               nonVisible = new MethodBinding[] {method};
+                                       } else {
+                                               int length = nonVisible.length;
+                                               System.arraycopy(nonVisible, 0, nonVisible = new MethodBinding[length + 1], 0, length);
+                                               nonVisible[length] = method;
+                                       }
+                                       nonVisibleDefaultMethods.put(method.selector, nonVisible);
+
+                                       if (method.isAbstract() && !this.type.isAbstract()) // non visible abstract methods cannot be overridden so the type must be defined abstract
+                                               this.problemReporter().abstractMethodCannotBeOverridden(this.type, method);
+
+                                       MethodBinding[] current = (MethodBinding[]) this.currentMethods.get(method.selector);
+                                       if (current != null) { // non visible methods cannot be overridden so a warning is issued
+                                               foundMatch : for (int i = 0, length = current.length; i < length; i++) {
+                                                       if (areReturnTypesEqual(method, current[i]) && areParametersEqual(method, current[i])) {
+                                                               this.problemReporter().overridesPackageDefaultMethod(current[i], method);
+                                                               break foundMatch;
+                                                       }
+                                               }
+                                       }
+                               }
+                       }
+                       superType = superType.superclass();
+               }
+       }
+
+       for (int i = 0; i <= lastPosition; i++) {
+               ReferenceBinding[] interfaces = interfacesToVisit[i];
+               for (int j = 0, l = interfaces.length; j < l; j++) {
+                       superType = interfaces[j];
+                       if ((superType.tagBits & InterfaceVisited) == 0) {
+                               superType.tagBits |= InterfaceVisited;
+                               if (superType.isValidBinding()) {
+                                       if ((itsInterfaces = superType.superInterfaces()) != NoSuperInterfaces) {
+                                               if (++lastPosition == interfacesToVisit.length)
+                                                       System.arraycopy(interfacesToVisit, 0, interfacesToVisit = new ReferenceBinding[lastPosition * 2][], 0, lastPosition);
+                                               interfacesToVisit[lastPosition] = itsInterfaces;
+                                       }
+
+                                       MethodBinding[] methods = superType.unResolvedMethods();
+                                       nextMethod : for (int m = methods.length; --m >= 0;) { // Interface methods are all abstract public
+                                               MethodBinding method = methods[m];
+                                               MethodBinding[] existingMethods = (MethodBinding[]) this.inheritedMethods.get(method.selector);
+                                               if (existingMethods == null) {
+                                                       existingMethods = new MethodBinding[] {method};
+                                               } else {
+                                                       int length = existingMethods.length;
+                                                       for (int e = 0; e < length; e++) {
+                                                               MethodBinding existing = existingMethods[e];
+                                                               if (areParametersEqual(method, existing) && existing.declaringClass.implementsInterface(superType, true))
+                                                                       continue nextMethod; // skip interface method with the same signature if visible to its declaringClass
+                                                       }
+                                                       System.arraycopy(existingMethods, 0, existingMethods = new MethodBinding[length + 1], 0, length);
+                                                       existingMethods[length] = method;
+                                               }
+                                               this.inheritedMethods.put(method.selector, existingMethods);
+                                       }
+                               }
+                       }
+               }
+       }
+
+       // bit reinitialization
+       for (int i = 0; i <= lastPosition; i++) {
+               ReferenceBinding[] interfaces = interfacesToVisit[i];
+               for (int j = 0, length = interfaces.length; j < length; j++)
+                       interfaces[j].tagBits &= ~InterfaceVisited;
+       }
+}
+private void computeMethods() {
+       MethodBinding[] methods = type.methods();
+       int size = methods.length;
+       this.currentMethods = new HashtableOfObject(size == 0 ? 1 : size); // maps method selectors to an array of methods... must search to match paramaters & return type
+       for (int m = size; --m >= 0;) {
+               MethodBinding method = methods[m];
+               if (!(method.isConstructor() || method.isDefaultAbstract())) { // keep all methods which are NOT constructors or default abstract
+                       MethodBinding[] existingMethods = (MethodBinding[]) this.currentMethods.get(method.selector);
+                       if (existingMethods == null)
+                               existingMethods = new MethodBinding[1];
+                       else
+                               System.arraycopy(existingMethods, 0,
+                                       (existingMethods = new MethodBinding[existingMethods.length + 1]), 0, existingMethods.length - 1);
+                       existingMethods[existingMethods.length - 1] = method;
+                       this.currentMethods.put(method.selector, existingMethods);
+               }
+       }
+}
+private ReferenceBinding errorException() {
+       if (errorException == null)
+               this.errorException = this.type.scope.getJavaLangError();
+       return errorException;
+}
+private boolean isAsVisible(MethodBinding newMethod, MethodBinding inheritedMethod) {
+       if (inheritedMethod.modifiers == newMethod.modifiers) return true;
+
+       if (newMethod.isPublic()) return true;          // Covers everything
+       if (inheritedMethod.isPublic()) return false;
+
+       if (newMethod.isProtected()) return true;
+       if (inheritedMethod.isProtected()) return false;
+
+       return !newMethod.isPrivate();          // The inheritedMethod cannot be private since it would not be visible
+}
+private boolean isSameClassOrSubclassOf(ReferenceBinding testClass, ReferenceBinding superclass) {
+       do {
+               if (testClass == superclass) return true;
+       } while ((testClass = testClass.superclass()) != null);
+       return false;
+}
+private boolean mustImplementAbstractMethod(MethodBinding abstractMethod) {
+       // if the type's superclass is an abstract class, then all abstract methods must be implemented
+       // otherwise, skip it if the type's superclass must implement any of the inherited methods
+       ReferenceBinding superclass = this.type.superclass();
+       ReferenceBinding declaringClass = abstractMethod.declaringClass;
+       if (declaringClass.isClass()) {
+               while (superclass.isAbstract() && superclass != declaringClass)
+                       superclass = superclass.superclass(); // find the first concrete superclass or the abstract declaringClass
+       } else {
+               if (this.type.implementsInterface(declaringClass, false)) {
+                       if (this.type.isAbstract()) return false; // leave it for the subclasses
+                       if (!superclass.implementsInterface(declaringClass, true)) // only if a superclass does not also implement the interface
+                               return true;
+               }
+               while (superclass.isAbstract() && !superclass.implementsInterface(declaringClass, false))
+                       superclass = superclass.superclass(); // find the first concrete superclass or the superclass which implements the interface
+       }
+       return superclass.isAbstract();         // if it is a concrete class then we have already reported problem against it
+}
+private ProblemReporter problemReporter() {
+       return this.type.scope.problemReporter();
+}
+private ProblemReporter problemReporter(MethodBinding currentMethod) {
+       ProblemReporter reporter = problemReporter();
+       if (currentMethod.declaringClass == type)       // only report against the currentMethod if its implemented by the type
+               reporter.referenceContext = currentMethod.sourceMethod();
+       return reporter;
+}
+ReferenceBinding[] resolvedExceptionTypesFor(MethodBinding method) {
+       ReferenceBinding[] exceptions = method.thrownExceptions;
+       if ((method.modifiers & CompilerModifiers.AccUnresolved) == 0)
+               return exceptions;
+
+       if (!(method.declaringClass instanceof BinaryTypeBinding))
+               return TypeConstants.NoExceptions; // safety check
+       BinaryTypeBinding binaryType = (BinaryTypeBinding) method.declaringClass;
+
+       for (int i = exceptions.length; --i >= 0;)
+               if (exceptions[i] instanceof UnresolvedReferenceBinding)
+                       exceptions[i] = (ReferenceBinding) binaryType.resolveType(exceptions[i]);
+       return exceptions;
+}
+private ReferenceBinding runtimeException() {
+       if (runtimeException == null)
+               this.runtimeException = this.type.scope.getJavaLangRuntimeException();
+       return runtimeException;
+}
+public void verify(SourceTypeBinding someType) {
+       this.type = someType;
+       this.computeMethods();
+       this.computeInheritedMethods();
+       this.checkMethods();
+}
+public String toString() {
+       StringBuffer buffer = new StringBuffer(10);
+       buffer.append("MethodVerifier for type: "); //$NON-NLS-1$
+       buffer.append(type.readableName());
+       buffer.append('\n');
+       buffer.append("\t-inherited methods: "); //$NON-NLS-1$
+       buffer.append(this.inheritedMethods);
+       return buffer.toString();
+}
+}